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Digestive System
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What are the general functions of the digestive system?
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Describe the specific functions of the following structures in the digestive system:
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Mouth
Stomach
Pancreas
Liver
Gall bladder
Small Intestine
Large Intestine
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Select colors from the drop down lists to identify these parts of the digestive system:
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Please select the color
Red
Green
Purple
Blue
Pink
Black
Large Intestine
Please select the color
Small Intestine
Please select the color
Liver
Please select the color
Stomach
Please select the color
Mouth
Please select the color
Tongue
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In the diagram below, list all the substances that are added to, or extracted from, the frog’s
digestive tract as food passes through. Also describe the state of the food at each stage.
Cloaca
Large intestine
Small intestine
Stomach
Mouth
Substances
added
Substances
extracted
Physical-chemical
state of food
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Food is digested in two ways. Mechanical digestion physically breaks down food into smaller
particles, while chemical digestion uses chemicals to break down individual nutrients.
In the chart below, determine for both frogs and humans which types of digestion (chemical
and/or mechanical) occur in each portion of the digestive tract.
Humansl
Mouth
Stomach
Small intestine
Large intestine
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In the frog’s mouth, what function do the vomerine teeth serve?
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The stomach breaks down food in the following ways:
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a. Where is pepsinogen produced?
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b. What changes it into pepsin?
c. What is the function of pepsin?
To break down proteins
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What are the folds of the stomach lining called?
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10 How does the digestive system avoid digesting itself?es and acid.
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Frogs
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a. How are nutrients passed from the small intestine to the liver?
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b. Why are these nutrients passed to the liver?
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Which part of the small intestine do bile and enzymes from the liver and pancreas enter?
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How do the secretions from the liver and pancreas interact with each other in the small
intestine?
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a. Use the pencil tool to circle the most effective surface for absorption.
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b. Why is this more effective than the others?
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a. What does the pancreas produce?
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b. How do these products get into the small intestine?
Digestive System • 5
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How does bile get from the liver to the duodenum?duct
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What is the function of bile?ch acid and activate enzymes.
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Compare to human
a. Where do feces exit in frogs?
b. In humans?
For further thought...
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Why are some enzymes introduced into the digestive system in an inactive form?
For further thought...
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A frog’s intestine absorbs toxins, such as venom in insects, along with nutrients.
The liver then filters these toxins out. Why is this filtering so important?
Independent Study Unit
Why are vitamins B and K produced by bacteria in the large intestine and not in the
stomach?
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The Crossword
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ACROSS
1.
5.
8.
10.
13.
14.
16.
17.
This controls the opening of the
cloaca (9)
It’s an endocrine gland and a
digestive organ! (8)
In the liver, fats, sugars and amino acids
are stored as this (8)
Unused substances are expelled
as this (5)
These are broken down by pepsin and
intestinal enzymes (7)
This stores food and breaks it into small
particles (7)
This process is completed in the small
intestine (9)
Enzyme that forms from pepsinogen (6)
DOWN
2. The canal where the large intestine narrows
(6)
3. The large intestine empties into this (6)
4.
The largest gland in the body (5)
6. Folds in the stomach (5)
7. First section of the small intestine (8)
9. These produce secretions in the stomach (6)
11. Tube between mouth cavity and stomach (9)
12. Bile is used to emulsify this substance (4)
15. The pancreatic ducts empty into this duct (4)